Connecting ring for the belt of breathing appliances



May 14, 1929. STELZNER 1,713,358

CONNECTING RING FOR THE BELT OF BREATHING APPLIANCES Filed June 7, 1928 HERMNN STELZNER Af 'q Patented May 14, 1929.

UNITEDSTATES PATENT OFFICE.

HEINR. & BERNH. nni'isnn, OFTLUBEGK, GER-MANY.

CONNECTING RING FOR THE BELT OF BREATHING APPLIANCES.

Application filed June 7, 1928, Serial No. 283,704, and in Germany September 2, 1927.

In applying breathing appliances, such as breathing masks, there is the inconvenience that some kind of belt or band is to .be attached at a: place which is not visible to the wearer. Generally in such cases the connection is made in this way that aring or link is placed on a hook of the appliance. Though such connection can be carried out comparatively easy yet there isthe diflicnlty that the link frequently slips away from the grip of the fingers. This is particularly the case When it is aquestion of a nape ring of masks or the like.

To avoid this inconvenience, according to the present invention the link or ring is roughened (serrated or knurled) on the outside, so as to facilitate the applying of the connecting pieces though they are not before the eyes and the wearer must solely rely on the feeling of the hand, thereby reducing or removing the danger of the ring slipping away from under the fingers.

Fig. 1 of the drawing is an elevation of a connecting ring held between two fingers ready to be applied to ahook, the fingers being shown in section. Y

Fig. 2 is an end View of a ring also held by thumb and finger of a hand, which itself is shown in elevation, and I Figs. 3 and are similar views as Figure 1 of modified forms of a link. 7 v

The link or ring a fastened to the end of a belt 5 in usual manner, for instance a nape belt of a breathing mask, is gripped by the fingers e as shown in Fig- 2 when it is to be slipped on the hook 0. To secure the grip and prevent the link a from slipping awaythrough the fingers it is roughened or knurled, as shown in Figs. 1 to 8, or provided wlth teeth or serrations 03, as shown in Fig. 4.

This ensures a decided grip and hold, and slipplng off need no more be feared. The llnk lnstead of belng circular may be given any suitable shape, for instance oval,

wearer of the breathing appliance to project i between adjacent serrations when the ring is grasped by the fingers of the wearer. V

I In testimony whereof I have signed my name to this specification.

HERMANN STELZNER. 

